Railway braking apparatus



April 2, 1935. H. 1., BONE I RAILWAY BRAKING APPARATUS Filed Nov. 10, 1934 2 Sheets-Shet 1 IN VEN TOR e H n m Z kw Y B April 2, 1935. H, L BONE 1,996,139

RAILWAY BRAKI NG APPARATUS Filed Nov. 10, 1954 2 Sheets-Sheet 2 INVENTOR Herbert L Bone HIS ATTORNEY a6 'hand- 'side views, respectivelyyshowingxaon an'en- Patented Apr. 2, 1935 My invention relates-to :reilway: braking enp ar ratus, rand particularlypfcorbraking apparatus 01;

the type comprising'wheel-engaging brakingbars extending parallel to 'a, track *rail :and movable :5 toward and away, from the :rail into braking and non-:bmkingposltions. e

Morepartieu-larly, my presentinventionmelates to apparatus "of the type :described and claimed in Letters Patent of the -'-United :States No.

A 1,927,201, :granted :to me :on September '19, 1933,,

and-"h'asfor an object the provision-of meimsfiiorimproving certain features oi q-the apparatus Shown in said patent. :w; J.

"I will'describe-one form of apparatus :embome Y ing mvinvention, and willi-ithenpoint out-ethenovelieatures-thereofinclaims;

-Inithe accompanying'dmwings, Fig. lis-iowiew,

pattlyzinseotion and-ipartly in;elevetion; showing one form of tbraking *apparatus sembodying rmy invention. :Figs'. 23ml 3 are topmlan'and left;

larged 'scale the positioning innit U iorming mart of the apparatus illustrated in ,;l.'lg. '1; fig. 4 is an enlarged :sectional view of-the positioning unit shown ,in'the precedin'gfviews. j l

siz'nilar refetence characters refer ;to,:similar parts in allsfour views; H V

'iReierring to "the drawings; acter fl designates .one track :riiilxof T8, stretch of railway track, which traclzf'rail isi'securedto" rail supports '2Umounted' on -cross-ties1-j3ponly one rail support and one cross-"tie beingvisible :in the drawing. Extend-lngparallel to'the 81111, on opposite sides of the rail are'itwo braking bars-A and A, eachrcomprising, fas'ausual, aibrakezbeam 4 and:a.:brake"shoe 5.1 "ya I The braklng {bar 3A is arranged to be-moved atoward ;and awa,y from ;the :'rail.1..l by meanspf :a, lever 1 which is pivotallysupported-atoneend on a pivot pin 8;mounted.in the-rail supports 2..

' surface with a recess 1* 'whicnreceivesithemake ing bar A 7. The one end of the" lever 911s 'likei wise f inclined upwardly andextends'awuy fromthe'reil I at the side 0': the rail oppositdto the-"lever 1,;

and the other endfab of the lever 9 is inclined downwardly and extends away from therail below'ihe lever *1, The end 9 0! the fle ver l is provided in its upper-f surfaee with a recess 3 similar to the recess 1 in the lever 1 which re 7 11 139 339 7" I w v RAILWAY AKIN Arrange f j "Herbert -L. B0110, Pittsburgh, pa. a. mm m Union Switch & Signal-OompghifikwimflQ: -l a.=,-a..:eorpor$tlon:offPennsylvanigQ e -v L I 1 v ApplicafionINovemBer L1 o, Isn'QTSnI inm-Yz Ag 1' I 10:01am. (e1.-1ss-:-a z) y esneivtheiurkmg bar's-1L2. i is here cylinder-mer e :fluidkpressuregmotor iand the I thelreferenee ehar-i.

clockwise rfirectiomjtherehy .movmgn;the"braking j abraking: are fastened; to -the :levers by meansjot bolfs M which yess e elegranee, holesiin the-webs of the brake beamsiand igi; levers, areprovided; on the miner sicles of thei levers, 'Wnh 'IQQkJWQShQIS' 1H andnuts flh v The antenna-flee end ot'ytheglever 1 :isPiYoially J nn t d 'i ans b vo rp'imn w meanest a,.mvompm,u and anz adiustable screw.

eye *kiEWith 9,;piston li= oP I tingm;cylinde1fl. Formed :in -cylinder1i I} istan imjetpori; lithrough which fluid :pressure, usuallymir, gmapy-v at ti nes be admitted "to ihejiunpengiend ,oizthe cylinden 1 Theiwartsaarecsoipmportioned lever 1:1

biasedhyxxavltyto swmsiin a 'couniiei'aclockwise directiongandlthetlevjelifi iisrbiasednbyigmv ty t swing ainba; clockwise @dlxeetipn. It will be ,;ap-

,awayzirom therrail lwoward theirzinefieetivehn non-braking positions in which latter positions they out 10f i engagementx with therwlieels a. cam-or slocomotive .itraversinzi A when! however, cylinder: Ii! act-motor :M is supplied .nwith fluidtpres sureyleverj l :beswung inia clockwise direction; and :leveriiwill beswmig" n1;a"counter barsctoward itherraili't'zto thelr eflectiveior wbralge ing tpositi'ons'." when stlie brakinggbazsizoccupy'g theirbrakinigzpositions,athezabrakeishoesiiwillen j ga'ge the" oiiposite; side Iaces otiarcar wheel "traversingrrail Fl land williretardthe speed of lthescuu 5 i 7 1R iss-obvious that iltz desirable "to 2? aocurately" positioned with respect :to thexmil slizwh'en they are-.;imtheir ineflectiveiion znon 'braking positions; inorder insure ithait-theibrakei shoes! will not 'rengageithe' wheelsgo'f -or locomotives; whichshould vnot be retardedI while rpaisiugihrdugh :the'fbraking apparitusrand lt sisalsb obvious thatitfis able 'to' have .me brokingztpars l accurately "ipOSi? tione'd'mith irespectrto'the :rail I when :bmka ing' :bars :are moved "to :their eflective :or Y positions, :so vthat: cars which. are into ber-reterded mm enterithe bmliingia'ppamms'fsmootmy without danger :of :derailment. 37:1 .01 zaceon'xp-lisb: ing=these desirable results, :Izprovide s 3110831011 ing 11mm LU :embodying'tmvpresentwinvention;

' which" positioning unitalso performs the addi the nut 42 engages the stop sleeve. The stop tional function of assistingthe force of gravitysleevetis heldin the proper angular position in 7 in returning the braking bar A to its non-'brakthe tubular member 3i to permit the nut 42 to ingposition after it has been moved to its braking" pivot about the fulcrum formed on the upper end position as will appear more fullyvhereinafter. of the sleeve, bymeans of a lockscrew ilwhich 1 As here shown, the positioning unit U] comis screwed into the stop sleeve, and the outerend prises a supporting bracket H which is bolted of which extends into a recess provided in the 1 at its ends -.-to'the crpss-tiesggl upon which the lower 161M110: the tubular-member M "The end associatedrail supports are mounted; 'Tliei su p fplatel-32zoriithe tubularmmember1i3|jcooperates porting bracket '5" is formed with anfintegral with an adjustable stop screw 50 which is screwed upwardly extending cylindrical portion l8 (see rgthrough a tapped ho1e'5l provided in the upper Fig. 4)., and screwed onto'the upper end of this leve r 'l V cylindrical portion is a cylindfical n ember The stopsciw to is so adjusted that'when the which, together with the cylindricalportio t; l 8,1 l lever -l has beeni rotated in a counter-clockwise 15 forms a cylinder 20. A locking;plate lljsi-yfas direction, due tofits bias, to the position inwhich ten ed to the cylindrical portion l8 ,betwee'n- -.two-*the braking bar Al-woccupies the desired nonvertical ribs 22 by meansgoi a stud. 23 and; the bralgingposition with respect to the rail 1,3-this r upper end of this lockingfplat'e extends ii'ito"one stop'screw will move into engagement with 'the of a plurality of spaced recesses-f2!swhichffareyfend.aplate {Land the spring 31 -is made sufli formed-in the lower edge of the cylindrical mem-V ciently'stifiand is'assembled into thecylinder I9.

bai -ts, thusjp revent'ingi the cylifidlical member with"sumcient 'initlal 'compressibn 'eo' that'iwhen'.

" V I9- from becoming unscrewed dueto vibrationi Lthe adjustingscrew moves"into-engagementwith andth like; 1 The lower end or the-cylindrical end gimme under: the conditions-just portion 'lfi of the bracketill 'is'provided with-an "me sprihg' jwill hold the tubularmember- 3| in inwardly-intending annular flange 25 whichj the position shown in Fig." 1. .It {will beappar- A forms ashoulder li and-which *surrounds'a-c'enjent; therefore, that the positioninggunit cooper tr ny located 'openihg'qlt The11pper'hd otthe ates with the-stop screw '50 to, accurately position I acynndneai memblql i 11k W1 Di vidd with" thefbrakingbar A in its non-brakinglposition.

an annular'flange u'Ionning'a{shoulder fl' which V V surroundsa 'cent'rallyi located opening -30fthat WhEs beenrOtated in a clockwisedirectiorrtothe.

The'scre'w eye '41 is so adjusted that when lever I f -l sfax ally with the "0P '8 posed position in which'the braking bar A occupies its p i t n11 cy inderf fl i ia tu ular-member 1| desirednon-braking position, thef wrenchgripgli having its*-upperend' closed byan integral end will move into engagement withthe?rcap'33, and p t 32; a d having i i ired wiH-preventiurther rotation-oi'athisllever imtm by acap aa which is .sc'rewed'onto' the "tubular direction; It will 'be -seen;12therefore-;:fthat the, member; Theend-plates"is-provided' with an positioning unit also serves'"to accuratelylpositiorr annular flange :fl-"which 'fit's within th'e iopenin g' the braking bar A in'its'non-braki1i8{positionl:' e a i 30 withs'ome clearance and whichformsashoul n bm g b inted i ut that since the. spring. 7 'f l derfgs; The cap 33'i'fltsv theopening21withsome M constantly .bi t g gz new the clearance and forms a; shoulder fic JA 'composition in: which the wrench grip ISLTengages thej V pressed coilspringi'l-surrounds 'the'tubularmem cap 33', the springs acts-tor-assist the ioroe of her 3| and cooperates 'atfits upper end with a gravity 'in bias'ing-ithei-braking ban A toits'rnona 3 washer 38 which; inz'turn, cooperates with-thev braking position. The stifiness'woithe vspring fl s qul r l w e d r the sprin is suflicient to: insure: that the combined force O D W1tha wfi hffl whibh is Simila due to the bias of this'springfandtgravity will to-therwa'sher' 38, and which cooperateswit-lithe return; the lever 9-to itsfinon-brak-ingzposition shoulders 16 f and -36..* A' :spi in'g bolt ll zextends when nofiuidpressure is being supplied'to motor intojthelower 'end of thetiibular enibemu -M even;though;abnormalifriction shouldde- 'spring'ibolt-isv a: nutx tzewm h is locked in -;place' to' preventacounter-clockwiserotationof the lever;

' by ai 'pin 43; Surrounding the: springsbolfiflli aSj-Whenfluid pressureis admitted to cylind r" between thenut llandthe capifl is a;comp'res sed 1 ormotorMto separate-lev r nd L cbilP'spring-fl biases the spring boltztqja ma ne previously described: 1 a 2 i a; a

P0 n 1 i jw ep'p deo an inte a 7 The n t '42: 1's: so adjusted that .i when lever. 9- hexagonalwrench' grip ti senga'g'es theundersidej is f t t n a t rmckwise: directions by,

l .9 int-the r li'ej cap-33A r i hc prin rrnotor'M tothifpositionin whichthe'braking bar is imparted to the'springboltlflzwhen thef levergil' a istop sleeve' 46;. which cooperates v-.-with -tlie%nut m occupi s the desired brakin'g positioir, this nut 42 to'limitthedownwardimovenient ofthespring m intd ng' htfr 'itli th -y m' b t i la o formed'on then er' endo'fthesto sleeve;- end'of' the' springlbolt Q0isladjustablyconnected pp to the lever 9 by means of: a screw eye: 41 and a pin lat-"r0 permitithenecessaryxmotionywhich ls in ns se wit 11 m rotates'about'the pivot*-pin=,8,- the 93 84.! in a the 'cap33-through ;whichg.the sprin'g bolt'extend'si 9 aiidlthei piston l5 of imbtqi'fiM oc'cupies its pro: 7 ed positionfth leverjl'will be rotatedto ther thr ugh n 1 o'pemnm I @provided in theicap 33; yelop -between ithe layer 9 5 and the; pivot pin 1 8, a dadi s ysc $118 pperi'en'd oi this', 1 butfthe 'stifiness otlthis spring ;is not sufficient 60*" and :thefscrewfeye I5 is so 'adjustedthatwhen' intome tubularmember-ai isgmade'zcon iderably making 95* P t i t larger in :diameterthanf thc diameter of ithefl el irf f spring 'bolt,"andtheanutltis-made:intheEfomi I 'n rat of h ar t -a h -a a I ofa'irustrumofaconez i Furthermore, theiunderi a? iQ Q -Q 'W th nz bars r he side of the cap 331s iroiinded as shown, and the 'nonfbmkmg posltibnislim v h h Y .a. S

' upperend otthe stop sleevelli' is slopedupwardly: n h d a n d me su eiiad ontwo sides in a man ner -to formafulcrum about motor level 9 w fl ot v niag n e which'the spring bolt can pivotiwhen thespring clockwise directi n until-nut"; mov s -fi e b'oltismoveddownwardlytothe positibnin'which' e s t w op, sleeve. M5,w po

lever 1 will thenrotate in a clockwisedirection untiljpiston has completed ns-stroke. Both braking bars will then 'occupytheir -proper brakingpositions. V I V "1 a When the braking bars have} been moved to their braking positions and fluid pressur'eisivent ed from motor "M; lever 1 will f'fi'rst rotate in; a counter-clockwise direction toa the position in which the associated stop screw 50' engages the end plate 32 of the stop unit uafter which lever 9 will rotate in a clockwise direction to the position in which the'wrench -grip' 45- orthe =stopunit engages the end-cap 33 on the-sleeveftll In this pos'itionof thelevers, piston l'5' of'motor :Mwill occupy itsextreme retracted positionyand both braking bars will occupy theirncn braking posip twillcause aiorce to' beitransmittedithtouihthe Y .7 motor the lever -9, .the springribolt 470., nut: 412, V sleeve 46,-cap 33,'tubularmember 3i andwasher v tions.

I will now assume that thebrakingbars have been moved to their'braking p'ositions, and theta car'having extremely wide gage wheels-enters thel, r'etarder. Under these conditions,-the braking bar A will be forced away from-the' rail toward its non-braking position, thus causing a "force-to be transmitted through thelever Tandfiu'idprs- The sure motor 'M to the lever9; which force'will tend to rotate the lever 9 in the" direction to move-the braking bar- A toward the rail' past its proper braking position; As was previously'pointed out,

when the braking bars occupy theirbraking positions, the nut '42 is-in engagement withthe sleeve 46, and it will-'be-apparent; therefore, that any force exerted on" the lever!) tending tomove the braking bar-A toward the -rail- :past -'its"brakin'g position will be transmitted- {through the spring bolt 40, nut 42, sleeve 46, cap 3'3, tubular-member 3| and washer3'8'to theispring tl, whichs'pring willbecome compressed and will permit the nec-' essary movement of-the leverf-wi-thout causing damage to the retarderu A similar acti'ohwill take place if a car whichis to be retarded and which has normal g'age wheels entersthe retarder and the *retarder out of'adiustment so that the braking bar A is closer to the rail than its proper brakingposition. F 1 v I will now assume that the braking bars occupy their braking positions, and Lthata carihav ing extremely narrow gage wheels enters the retarder. Underthese conditions' braking bar A willbe' forced away fromtherailil, and :this movement of'the braking bar li will cause the whole :lever assembly to rotate in 'a clockwise direction around the pivot pin 8 against thegravity bias of lever land theimot'or Mb .Ai siinilar result will occur if a car having normal gage wheels enters the retarder:to bemetarded, and "the braking bar A iscloser to the rail thah its proper non-braking position due to the .parts jneing out of adjustment. 1 4. Y

If a loccmotivehaving exceptionally narrow gage driving wheels passes through thebraking apparatus whenthe brakinglbars arein their nonbraking positions, andthereby torces the braking bar AZ farther awayfrom the jrail than its none braking position, the lever"9- will rotate'in a clockwise direction, and this rotation oi the lever will act throughthe associated 'screweye]4 spring bolt 49, wrench grip 5, cap 33,-tubular member 31 and washer 39 of the p'ositioningunit II;- to compress the spring 31, thus permitting the lever and cylinder a'ssembly to rctate as a whole in a clockwise direction about the pivot pin f8. follows that no damage willres'ult to the re-' tarder underthese conditions-a j If a locomotive having exceptionallywide gage driving wheels passes through theretarder when the braking "bars are in' their non-brakingfposi-i tions, the outside braking bar" A19 will be moved farther away from the rail thanitsj non-braking' position, and the force. whichi is then exerted on the springt'l of the positioning unit byithe associated :stopscrew: '50; tubular member- 31 Candi washer-38, will compressthis spring and willlthus permit the lever-and cylinder assembly to rotate as a whole in a-counter-elockwise direction about 10' the pivot pin 8; thus :again preventing damagejjto theretarder.,-

rides up onto the braking barzjAk thetendency for the :lever assemblyas a: whole i to rotatein 2a If a-car wheel isfcrced out from between thex I brake shoes 6 due to too much retardation, :and

counter-clockwise direction about the pivot .pin;

38 to the spring '31. Ilie ispringfi3flz is made suf' ficiently" stiff so thatit will not becom'ezcomp'ressed under these conditions.' P

If the braking bars' sho'uld be'moveo toijtheir -e non-braking positions when :a cary is' riding on the braking "bar A therengagemen'tioi stop screw v 50 with the end plate-i'32 1 of the tubular member 3| -willcause the iorce-exertedonrthe'braking bar" I by the car to be transmittewtc the springfiflfi bar past its non-braking position.

and the screw eye 4'l is'j thenadj-usted by turning the spring-bolt 40 until the braking bars have the proper "braking position relative-to therail t. The screwifl'is then screwed downwardlytosuch a position that'when the'piston i5 .occupies'its a retracted position and the screw is engaging the end plate 32, thebraking bars will occupy their proper non-braking positions.

It should'be pointed'out that while, as shown in the drawings, the braking bars are operated by'onl-y on'e' lever and motor assembly, in actual practice} these braking bars will be 1 operatdby a plurality of -other {similar lever and motor as 'semblie's' disposed at-s'paced' intervals along the braking bars substantially inaccordance' with the disclosure "of; my 4 Patent No. "1,927,201 reierred" to a hereinbe'fore.

AlthoughI have herein "shown. and-described only oneef'orm "of railwayjbraking apparatus emf b'odymg. m .inventidn,- .11; s understood that various changes, andmodificationsmay 'be ;made.

my invention,

' Having thus-@escribed invention, I

claim is p a 21. :Railway braking :apparatu braking lbars looated on :opposite "sides 19f a' track gravity :to movecsaidbraking bars awayufrom the track .rail, :a fixed :cylnideridisposed between said :levers, cal-tubular fmembeninrsaidcylinder T5 closed at oneeend bylkan Iintegralsend :plate and therein within the scope. of ,the. appended e laims without departing fromgthe spirit ran'd scope. of

" partly cl'osed at the other endsbyan end cap,

7 means 'for biasing: said ,tubular member toone position in said cylinder, means carried by the I onelever and; cooperating with said {end plate to limit theL-movementjpf said one lever .due to its bias tothe:positionimwhich the, associated braking bar occupies -a predetermined non-brakingposition, anda boltjpivotallyconnected "at one end to the .other'leverandeXtendinginto said tubular member; through said end-pap, said bolt being providedwith means which cooperates with i said end cap to limit/the movement ore-said other lever dueto its =biasito the positioniniwhich the associated lever occupiesa predetermined no'n-brakingiposition with; respect to the track Q- 2 .;=.R.Iailway braking apparatus {comprising two braking barslocated on oppositesides-off a track 1 trail, twofipivoted'levers supportingisaid two brak'-i op'erating the' levers to move said braking bars ing bars respectively, agfluidpressure motor for toward the track rails, said-levers beingbiased with said end plate'to limit the movement of said I oneleyer due 't'o, its biastothe position in which "{the associated braking bar. occupies apredetermined non-brakingposition,a bolt ,pivotallye connected at, one end totheaother lever and eirtendinginto said tubular member Vthrough said end we; said zbolt being provided with means "which cooperates with said-end cap it!) limit the, -inovernentlof said \other lever due to its-bias to e @40 the 'position ,in,which thef associated lever occupies apredetermined non-braking position with respecttoithe track. rail, a nut on said bolt within said tubularmem'benandaspring surr0und,

ing said bolt between said nut and said end cap to,;assist theforce of gravity in restoring said other lever to the positioninwhich the associated braking bar occupies. its non-braking Vpo-.

sition.

7-; a 13;;Railway braking apparatus-comprising two braking bars located on :opposite sides of attack a rail. two pivoted, levers supporting said two braking bars respectively, a fluid pressuremotor ior operating thelevers to move said brakingbars toward the track I rail," said levers being, biased by gravityto move said'braking bars away from the-track rail, a fixed cylinder disposedbetween said levers, a tubillarl'member in said'cylinfderclosed? at Lone end-by an integral end" plate and partly closedj at the oth'e "end'b'y an, endjfcap, neansfer biasing said tubularimember to one po sitionin-said cylinder,fanfadjust'ablestop screw carried by the one lever 'and-cooperating with" e said end plate to limit; the movement Of said one" 7 1 "lever due-to'its' bias to theposition-in which the associated braking bars occupy" a predetermined non-braking position, aiboltpi'votally connected atone end to the other levei' and iextending into said tubularimember-through said endcap, a nut, on said bolt within said "tubular membenand a sle'eve'in' said tubular lmember cooperating'with said :nut and ,said cap'to' limit the rotation of saidiotherlever inthedirectionto move tli'eas-J sociated brakingbar toward the track rail to the position in'which'the associated braking bar 00- cupies a predetermined braking position.

wav b aki pp m st pris We braking bars located on opposite sidesjof a track rail, two pivoted levers supporting said-twobraking bars respectively, a-fiuid pressure motor for" op rating the le'vers to move said braking bars toward thetra'clr rail, said levers being biased by levers, rait l bularrmemberl in said cylinder closed at one end by; an j integral end ,plateaand partly nonbrakingposition; a'bfolt pivotally connected gravity to movelsaid braking bars'away from the track :raiL-a fixed vcylinder between said closedrat the other end by an end cap, means for biasing saidtubular; member to one ;-p1osition in saidzcylinder, adjustable stop screw] carried, by the one 1everandacooperating with said end plate-tol-imit the movement of said-one; lever due to its bias to the position in whichthe associated braking bar occupies, a predetermined at oneeiid to ftheiother'leverand extending into a 'said-tubular 'memben-through saidend cap; a

nut on said boltwithin said'tubularmembena sleeve in-said tubular. member cooperating with said otherlever in the direction to move thfiflS-I sociated braking bar toward the track rail torthe; position inwhich the associated braking bar ,oc-

cupies a predetermined braking position, a spring in. said tubular member surrounding said .bolt within said sleeve. ior assisting the force of gravity, in rotating said "Other-lever in the direction to' move said braking bar away from the track rail,

and means onsaidbolt cooperating with said'end canto limit the rotation or said otherleverin the direction tomovegtheassociated braking bar aw y am re e wo fromthe track rail;

r 5 Railway braking a braking bars located on opposite sidesot a, track said nutand said cap to limit'the rotation of;

railand adapted to, be 'movedntowardzand away from-the rail-into braking and non-braking positions, a first lever 'for supporting ione V-of said. brakingbars, .said first lever being 'pivotally mounted at one endon'a fixed pivot pin and;

having its vfree. end inclined upwardly and extending away from said rail asecond lever-pivotially mounted intermediateits-ends on said pivot pin andhaving'one end inclinedupwardly and extending away from said 1railin a positionto other end inclined downwardly and extending 'awayfrom the rail below the free end of said first lever,.,the parts being so proportioned that said braking bars are biased totheirj nonbraking positions by gravity,v a fluidpressure-motor for op;-

erating the levers; a hired cylinder mounted in a substantiallyvertical position between said levers;

a tubulari member in said cylinder havingone" end closed by an integral endlplate andtheother sociated braking, barawayjfrom, the ml to the position in whichzthe' associated braking bar occupies itsnon-braking position, a bolt.-pivotally .supportthe other braking barand having its end partly closed by'an end cap, melamsin'said 7 cylinder for ,biasinglsaid tubular memberto one position, an adjusting screw screwed through the 'first lever and cooperating; iwithisaid tubular I member at [said end .plate to limit the rotation of saidfirst lever in'the direction to move the "as attachedjjto said other end ofsaid second leve'r' I and extending into said tubular memberthrough said fend cap and provided with means which cooperateswith said end cap to, limit-the: rotation of said second lever-in the direction to move Y the associated, braking baraway fromthe rail to the position in-which the braking bar occupies its non-braking position, a nut on'said bolt within said tubular member, a compressed springs surro nd na s d o bet'w e sa E ut aisa d: n I Q i an t assist :i -m ce-Qf-eb se ndt e e m t e Petit n V, a bra in b We tern -met e on: a d -a eve in; aidib la .m n

v v. mifth e ect o 'tmmq a s c a b k-me a flew-ere he ai th n i awh hwthe .b ak n ib O ani br n c e i -ihe-ee ts eie -se w lr i esl that when said secondf lever,.occupies theposi tionin which the associated braking bar occup es its bralring pgsitiqmandthefpiston of said fluid pressure motor'occupies its projected position said first lever will occupy the position in, which the associated braking bar occupies its braking position. 3

6. Railway braking apparatus comprising, two

braking bars disposed on opposite sides of a track rail and movable toward and away from the rail into braking and non-braking positions, two pivoted levers supporting said two braking bars respectively, a fluid pressure motor operatively connected with the levers for moving the braking bars to their braking positions, the parts beingv so proportioned that the braking bars are biased to their non-braking positions by gravity, a fixed bracket formed with a cylindrical portion which is disposed between said levers, a cylindrical member screwed onto one end of said cylindrical portion and forming with the cylindrical portion'a 1 cylinder of adjustable length, a first inwardly extending annular flange on said cylindrical portion at the end opposite to said; cylindrical member forming a first shoulder, a second inwardly extending annular flange on said cylindrical 7 member at the end opposite said cylindricalportion forming a second shoulder which faces said first shoulder, a tubular member in said cylinder closed at one end by an end plate provided with a flange forming a third shoulder which is adapted to align with said second shoulder, an end cap on the other end of said tubular member forming a fourth shoulder which is adapted toalignwith said first shoulder, a compressed coil spring surrounding said tubular member within said cylinder, two Washers in said cylinder one disposed between one end of said spring and said first and fourth shoulders and the other disposed in said tube between the other end of said spring and said second and third shoulders, means carried by the one lever and cooperating with said end plate to limit the movement of said one lever due to its bias to the position in which the associated bars to their braking positions, the parts being so proportioned that the braking bars are biased to their non-braking positions byvgravity, a fixed bracket formed witha cylindrical portion which is disposed between said levers, a cylindrical member screwed onto one end of said cylindrical portion and forming with the cylindrical portion a cylinder of adjustable length, a spring disposed es pe eteclvbrelseiebanlpteuries pos t nr ani1- me t esmredemih theraes p e ai s ie e n e t6 i iisiii e & 5r bar occupies its non-braking position.-

8. Railway braking apparatus comprisingtwo braking barsdisp'osed on opposite sides of a track rail and movabletoward and away from the rail into braking and non-braking, positions, two pivoted levers supporting said two braking bars respectively, a fluid pressure motor operatively connected with the levers'for moving theibraking bars to their braking positions, the parts being so proportioned that'the braking bars are biased to their non-braking positions bygravity, a fixed c bracket formed with'a cylindrical portion which is disposed between saidlevers, a cylindrical member screwed onto oneend oftsaid cylindrical portion and forming with the cylindrical portion a cylinder of adjustable-length, a spring disposed'in i said cylinder and having an initial compression which dependsupon the adjusted position ofsaid cylindrical member, a second member axially movable insaid cylinder in both directions and,

biased to one position by said spring, means carriedby the one lever and cooperatingrwith said second member to limit themovement of saidone.

lever due. toits bias to the position in'which the associated braking bar occupies its non-braking I position, means secured to the other" lever and l cooperating'with said second member to limit the movement of said other lever due to its bias to the cupies its non-braking position, [a pair of ribs formed on said cylindrical portion, a plurality of recesses formed in saidcylindrical member, and] "position in which the associated braking bar oca locking-plate secured to-said cylindrical portion between said ribs and cooperating with one of said recesses to lock said cylindrical member in an.

adjusted position. r

'9. Railway'braking apparatus comprising itwo f braking bars disposed on opposite sides of ;a

track rail and movable toward and'awayv from the rail into braking and non braking positions, two pivoted-levers supporting said-two braking] bars respectively, a' fluid pressurefmotor operatively connected with the levers for moving the braking bars to-their braking positions, the parts being so proportioned that the braking bars are biased to their non-brakingpositions by gravity, a fixed bracket formed with a cylindrical portion which is disposedbetween saidvlevers, a cylindrical member screwed onto one end of said cylindrical portion and forming with the cylindrical portion a cylinder of adjustable 'lengthia spring.

disposed in said cylinder andhaving an initial compression which depends upon the adjusted position of said cylindrical member, a second member axially movable in said cylinder in both directions and biased to one positionfbyfs'aid spring, means carried'by the one lever and cooperating with s'aid second member to limit the movement 'of'said one lever due to its bias to the position in which the associatedbraking bar 00- cupies its non-braking'position,'means secured to the other lever and cooperating with-said second '7 iiiemb'er td'limit the 'mbvg'ment of othe'r lever u'ei bum heimmc which: us m biated br g kin'g baf'dcc'lifile itshidibliraking mom; plurality of-Spglced regsses' tormedgln 'said' -c'y1indfi;a1 member; 'a'nd 'mans to said" cylindrical l portion and i bo iefati n'g" with one of q -10;Ra11way"brakingapbar hiiofipbrising two.

braking-bars loated on opposite side; of a, tmck 'railftwo pivqtedlevers supportlngfgaid two brakjttiwaid bars) away froni'the tram mu tp-nbn bx kl'ng' levers; 'a'tublflall member Mashed to 9m: pb'sljzion' J- I within {said cylindenand' adjiis't'able 'means;f se'- Clhgq to sadd twolevers a nid cooperaxing resp e'- 4 Qtlveljwitlfthe obposltends OI said tubulai w their gravity bi s tj pbsition m wmenfjsam' id rakin b P th d red in ra i s j 

